Jump to content
bamajoe

Can A GPX Or Sd 2300 Discriminate Iron?

Recommended Posts

I doubt that we have much gold here in Alabama, we're too far from the beach, and not much civil war fought here, so, that leaves coin shooting . However, we do have lots of iron in the ground (bad soil) and rusty nails. Will the GPX's, SD2200's or 2300's actually discriminate  iron good enough to be able to go a little deeper than my CTX3030? My CTX is good for about 4" in worst soil and 7" at best. I need something to get a little deeper. The only PI's that I've owned is the original TDI several years back and presently have a TDI SL. The original TDI was deeper than the SL and I was thinking that I could tell small iron nails while adjusting GB would lose nails at "5" on GB then continuing to hear hi conductors on down to "3" on GB. I can in no way tell a rusty nail from a high conductor with the TDL SL. Will any PI discriminate good enough to detect only high conductors? IF no, then I'm waiting on the Fisher Manta. Thanks, Joe

Share this post


Link to post
Share on other sites

Manta will be in the same boat.  Loosing the high conductive nails will loose high conductive silver. The tester that posts as LeJag on Dankowskis forum has discussed it a few times. 

  • Like 2

Share this post


Link to post
Share on other sites

Basically, no. The GPX is about as good as it gets with both tones and a shallow iron disc function, but it is far from perfect. Garrett ATX the same but not as powerful.

Minelab GPX Discrimination

GPX Iron Reject

The Manta no matter what they say will have ferrous limitations. Nature of the beast.

  • Like 2

Share this post


Link to post
Share on other sites

Running a GP series or GPX4000 or 4500 in the Salt timing will as part of the timing lose some very small low conductors. 

Also a big DD will achieve the same. But the actual Iron Reject circuit will only reject iron target that it is sure is iron, i.e. small and deep iron will still signal as normal. 

Thanks for linking my article Steve. 

  • Like 1

Share this post


Link to post
Share on other sites

Thanks for all the help.. Steve, I read all the 2015 treads from Paul from California...I think that is "OLD California" on some other sites. Started to message Paul but he hasn't posted in several months...just hope his health is okay....Yeah, I'm beginning to realize the PI iron limitations that you are referring to. Have only used a TDI PI machine that apparently more limited as compared to ATX, SDC, or GPX...I was just hoping that the GPX would be so deep that maybe it could discriminate iron to at least 7" in my bad soil....If it could then it would help me get beyond my VLF limit. I want to try a GPX or the newly released Fisher I Pulse AQ....Not sure when the AQ will be available for purchase and not sure if much advantage over the GPX...however, the price said to be between $2100 and $2500 is about the same as a new GPX4500....about $1000 less than a new GPX5000....if I had your money then it would be such a proble..I'd just get both. Thanks, Joe 

Share this post


Link to post
Share on other sites

The TDI rejects ferrous as well as any of them if not better due to the manual GB control. I wrote the original article about it. I can use a TDI and dig minimal ferrous, but then it gets no more or less depth than a good VLF.

Paul has left all the forums. The last place I saw him post was Findmall. He might still be on Geotech.

It would be nice to be free of monetary concerns. You own more PI detectors than I do right now.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Similar Content

    • By Cleggy
      Can I reduce the sensitivity of my GPX 5000 but still keep good depth. 
      I'll show you the problems I'm getting in this video
       
       
    • By Joe76
      In FNQ Australia, there are a number of properties you can go on & detect for gold. Most places are pay to detect & are well set up for camping with designated areas set aside for metal detecting, if you are fortunate enough to have access to private leases & cattle stations with gold bearing country even better again. Up until today, I had access to one of these private cattle stations to prospect on. Unfortunately I no longer have access, this is due to the fact there are still people doing the wrong thing while on these properties. The rubbish left behind at camp sites and open detector holes for cattle to break legs in is out of control. On top of that you got fence jumpers & poachers running a muck too. This is causing huge issues for for graziers forcing them to close the gates to everyone & in most cases getting access now, is nearly impossible. 
      I can't express in words how disappointing this is for us guys & girls who are doing the right thing, only to be told you can't detect at your favourite spot anymore because of w#%kers ruining it for everyone. So the quest for a new spot starts again....  Take only gold and memories & leave only foot prints. So we will all have somewhere to look for gold in the future!
       
       
    • By Steve H
      Found this in P.A in family farm . Looks like a broke golden arrowhead . Not sure any ideas . It's was about a foot in the ground  solid the whole way through and very heavy . 

    • By Tnsharpshooter
      https://metaldetectingforum.com/showthread.php?p=3118425#post3118425
    • By phrunt
      I was looking around the new Minelab website and I noticed they now say the Equinox is single frequency on Gold Modes, is this some sort of error or are new Equinox 800's coming without multi-IQ on their gold modes?  I found nothing wrong with MultiIQ Gold modes so I don't see why they'd change it.
      https://www.minelab.com/metal-detectors/equinox-800
      Detect Modes
      Equally adaptable for all target types and ground conditions:
      Park Field Beach Gold: Gold Mode operates the high single frequencies of either 20 kHz or 40 kHz to detect gold nuggets in mineralised soils.  
       
    • By dan_h
      Used Cherry Pick settings from the Handbook for  a brief session in a local park.  Found a penny, the handle of a spoon.  If it ever was silver plated, that is long gone.  Then found a quarter-sized disk, a token of some sort.  It says "Where a kid can be a kid" on both sides and one side was stamped OTTS.ORG.  I  just tried that website and it is apparently closed.  There was a message to the effect to leave your contact info if you have any business with this site.
       
      Question:  is there something more than the Lesche Predator but less than a shovel -- a mini shovel, perhaps?
×
×
  • Create New...